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Chapter 6. Saving a configuration change to a working file

Save configuration changes to a file to stage updates without affecting the active CIB. You can then define multiple changes without immediately updating the running cluster.

Note

Although you should not edit the cluster configuration file directly, you can view the raw cluster configuration with the pcs cluster cib command.

The following is the recommended procedure for pushing changes to the CIB file. This procedure creates a copy of the original saved CIB file and makes changes to that copy. When pushing those changes to the active CIB, this procedure specifies the diff-against option of the pcs cluster cib-push command so that only the changes between the original file and the updated file are pushed to the CIB. This allows users to make changes in parallel that do not overwrite each other, and it reduces the load on Pacemaker which does not need to parse the entire configuration file.

Procedure

  1. Save the active CIB to a file. This example saves the CIB to a file named original.xml. 

    # pcs cluster cib original.xml

  2. Copy the saved file to the working file you will be using for the configuration updates. 

    # cp original.xml updated.xml

  3. Update your configuration as needed. The following command creates a resource in the file updated.xml but does not add that resource to the currently running cluster configuration. 

    # pcs -f updated.xml resource create VirtualIP ocf:heartbeat:IPaddr2 ip=192.168.0.120 op monitor interval=30s

  4. Push the updated file to the active CIB, specifying that you are pushing only the changes you have made to the original file. 

    # pcs cluster cib-push updated.xml diff-against=original.xml

  5. Alternately, you can push the entire current content of a CIB file with the following command. 

    # pcs cluster cib-push filename

  6. When pushing the entire CIB file, Pacemaker checks the version and does not allow you to push a CIB file which is older than the one already in a cluster. If you need to update the entire CIB file with a version that is older than the one currently in the cluster, you can use the --config option of the pcs cluster cib-push command. 

    # pcs cluster cib-push --config filename
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